Frequently Asked Java Program 13: Factorial of a Number

Topic : Factorial of a Number

Notes:
--------
A factorial is a function that multiplies a number by every number below it.

For example

5!= 5*4*3*2*1=120.
OR
5!= 1*2*3*4*5=120.

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[anshumansehgal]

Thanks sir a lot...really liked the series..please make array set of questions as well. Thanks

[hemmishra]

//using while loop
import java.util.Scanner;

public class FactorialOfANumber {
public static void main(String[] args) {
System.out.println("Enter a number :");
Scanner sc=new Scanner(System.in);
int num;
num=sc.nextInt();
int number=num;

int res=1;


while (num>0)
{
res=res*num;
num--;

}
System.out.println("Factorial of "+number+" is: "+res);
}
}

[nickthelover]

Good explanation. But did not cover while loop

[kennyi]

Recursion would go as well public static long factorial(int number) { if(number>=1) return number*factorial(number-1); else return 1; } and SysOut factorial(5);

[sanjayyadav-xemf]

very simple explanation...thaanks a lot sir

[kogilathotavijayreddy]

Find factorial of a big number using Big integer because if we do using int for big numbers it will stack overflow

[bommanareddaiah]

Sir reversing number lo scanner.ani yenduku vachhindi bro

[anandsharma]

Could have explained recursive solution as well. Mostly interviewers look for that.

[madhukiransunkara]

Sir Make an video about ISTQB Fundamental level certification Details and How to prepare for it

[NA-DEVIL]

Sir thank you God is great Sir op promote us also please in community's post

[niteshwar]

public class Main
{
public static void main(String[] args) {
int num=5;
long fact=1;
while(num!=0){
for(int i=1;i<=num;i++){
fact=fact*i;
}

}
}
why it is not providing correct output?